The review of 4433688..0808779 (read-only, a separate agent) found one
medium and some lows; all fixed here.
Medium, proven by the reviewer: A1's userKey put the typed username into
the limiter map whole, and the public forms had no body bound beyond
net/http's 10 MiB for a parsed form - each refused request kept up to
10 MiB in memory for fifteen minutes. userKey now holds a 96-bit hash of
the folded name, and sign-in, reset, a reset link's page and setup read at
most 64 KiB (limitForm, http.MaxBytesReader).
TestPublicFormsAreBoundedAndKeysShort.
Lows:
- Refund skipped the request that filled a bucket (count < max), so a
right password at the ceiling left the shared address blocked; Refund
now always undoes the Allow it follows.
- The reset form did not give the address its attempt back when the
name's bucket refused (sign-in did); it does.
- A3's day of five links is spent only by a link that goes out, and the
price of the pause - anyone knowing a username can pause that owner's
reset for a day - is recorded in security.md.
- longHeaderLine counted a trailing CR on a header's first line.
- test.yml declares permissions: contents: read.
Not changed, as the review's nits: the store matches names exactly while
the limiter folds them (stricter, said in the comment now); a session from
a longer window is honoured until its next Touch (the next request).
go test ./internal/web/auth ./internal/milter.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
mixandClaude Opus 5.5
32f6ed626d